I wasn't happy with the existing singlesided serial PCB; it didn't look like something I could make using cheap hobbyist techniques like toner transfer. So I'm working on a new version that keeps the same board size and "shield connector" placement, but takes the typical trace width up to 0.8mm, increases pad sizes (restring 45%), avoids running traces between pins (not that you COULD, with those design rules!) and takes the minimum clearance up to 0.4mm. It has 9 jumpers (vs 6 in the original), all but one of which are power/gnd. My initial version has a smt max233 on it, but other rs232 converters should fit. I think.
Is there any interest in this, or is everyone buying their boards? (it has not been built or tested yet...)